Difference between revisions of "Lab 8 TF EIM"
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2.) attach an Oscilloscope set to 1M<math>\Omega</math> input impedence so the probe is located at point B. The oscilloscope's internal resistance will serve as a Resistor (R) to measure the voltage across the diode and calculate the current. | 2.) attach an Oscilloscope set to 1M<math>\Omega</math> input impedence so the probe is located at point B. The oscilloscope's internal resistance will serve as a Resistor (R) to measure the voltage across the diode and calculate the current. | ||
| − | 3.) Measure the diode reverse current <math>I_r < 1 \mu A</math> as a function of the DC supply voltage. | + | 3.) Measure the diode reverse current <math>I_r < 1 \mu A</math> as a function of the DC supply voltage. (30 pnts) |
| + | |||
| + | |||
| + | 4.) Fill in the blank. The reverse biased diode act as a constant _______________ source. (5 pnts) | ||
=Forward Current= | =Forward Current= | ||
Revision as of 17:13, 14 February 2011
Lab 8 The Diode Objective: Measure the current-voltage curve of a silicon diode.
Reverse current
1.) Construct the circuit below using a DC power supply, a diode.
2.) attach an Oscilloscope set to 1M input impedence so the probe is located at point B. The oscilloscope's internal resistance will serve as a Resistor (R) to measure the voltage across the diode and calculate the current.
3.) Measure the diode reverse current as a function of the DC supply voltage. (30 pnts)
4.) Fill in the blank. The reverse biased diode act as a constant _______________ source. (5 pnts)
Forward Current
- now swap the diode direction and repeat the measurement in the previous section.
Graph
- make the same measurements in parts 1 and 2 above for a germanium diode.
- Plot the diode current (on the ordinate) versus the diode voltage (on the abscissa)for both diodes on the same graph. (50 pnts)
Questions
- The reverse biased diode acts like a constant ____________. (10 pnts)
- The forward biased diode has a very __________ resistance. A reverse biased diode has a very ____________ resistance.(10 pnts)
- The approximate DC forward resistance for diode #___________ is _________ when the forward current is _______________.(10 pnts)
- The approximate DC reverse resistance for diode #___________ is _________ when the forward current is _______________.(10 pnts)
- The silicon diode #___________ has an approximate turn on voltage of ___________.(10 pnts)